Bearing fatigue life is calculated using a so called basic rating equation L10=CPp where the operating load translated into an equivalent P and divided by bearing capacity. This makes it possible to test capacity C under arbitrary therefore on almost any rig. For grease such concept does not exist. Grease specified number of hours running standardized rigs conditions. A similar as for introduce...

Abstract Lubricating greases are widely used in e.g. open gear drives and gearboxes with difficult sealing conditions. The efficiency heat balance of grease-lubricated depend strongly on the lubrication mechanisms channeling circulating, for which grease flow is causal. computational fluid dynamics opens up possibility to visualize understand more detail. In this study, a single-stage gearbox l...

Lubricating greases are colloid disperse systems consisting of a base oil and a thickener (additional additives). The lubricant is modeled as a tribological system, and the reaction of a fluid friction stress is investigated. The energetic situation of the volume element is analyzed and the system entropy described. The description of the structural degradation and the used entropy was realized...

The rheological properties of lithium grease and polyurea at different temperatures consistencies were determined with a rotary rheometer. plateau moduli the greases calculated, mechanism influence consistency temperature on was explained. tribological wear two measured by high-temperature friction tester. mechanisms are probed lubricating grease. results show that modulus GN can be used to ass...

The behaviors of two lithium lubricating greases were investigated under EHL circular contact through measurements of traction coefficients on a self-made rig in which the contact was continuously fed with fresh grease. The average values of Erying shear stress and shear modulus of the two lithium greases were obtained from traction experimental data using this rig. Based on the Evans-Johnson m...

The bleed rate of a grease may change over time due to degradation the thickener microstructure and decrease in oil content, as is released from grease. In this work, properties—quantified by permeability—of five types lubricating greases are studied. Controlled shear ageing performed using worker. It shown that does not significantly worker at room temperature, opposed changes rheology microst...

The results of research on the process applying lubricating coatings are presented in this work. For purpose, plastic greases were used, which base oil is perfluoropolyether (PFPE) and thickener poly(tetrafluoroethylene) (PTFE). Due to their consistency, these materials classified into different classes according National Lubricating Grease Institute (NLGI). was carried out using a time-pressur...